/Engine/Source/Runtime/MovieScene/Public/Channels/MovieSceneChannelHandle.h
Construction from a weak channel proxy, and the channel's index
TMovieSceneChannelHandle ( [TWeakPtr](API\Runtime\Core\Templates\TWeakPtr)< [FMovieSceneChannelProxy](API\Runtime\MovieScene\Channels\FMovieSceneChannelProxy) > InWeakChannelProxy, int32 InChannelIndex )